Sony GV-A500E, Service Manual

Page: 102 / 127

5-43
8. Burst Cleaning Adjustment for PAL model
(VC-197 baord)
Adjust to the optimum PAL chroma signal demodulation phase. If
the phase is not correct, moire distortion noises will stand out.
Mode VTR stop
Signal Color bar
Measurement point Pin
2
of CN802 (VG) of VC-197
board
Measuring instrument Oscilloscope
Adjustment page D
Adjustment address 54, 5E
Specified value A = 0 ± 50 mV
Note : Perform “7. Burst Cleaning Adjustment for PAL model”
and “8. Color Adjustment for PAL model” alternately until
each specified value is satisfied.
Adjusting method:
1)
Set page: 0, address: 01, data: 01.
2) Change the data of page: D, address: 54, and adjust so that the
flicker amplitude (A) of the cyan section becomes minimum.
3) Press the PAUSE button of the adjusting remote commander.
4) Set the same data as page: D, address: 54 to page: D, address:
5E, and press the PAUSE button of the adjusting remote
commander.
5) Set page: 0, address: 01, data: 00.
6) Check that the specified value of “Color Adjustment for PAL
model” is satisfied, if not, perform “Color Adjustment for PAL
model”.
Fig. 5-3-32.
2H
A
Cyan
9. Color Adjustment for PAL model (VC-197 baord)
Set the color saturation to the standard value. If deviated, the color
will be to dark or light.
Mode VTR stop
Signal Color bar
Measurement point Pin
2
of CN802 (VG) of VC-197
board
Measuring instrument Oscilloscope
Adjustment page D
Adjustment address 53
Specified value A = 0.37 ± 0.05V
Note : Perform “7. Burst Cleaning Adjustment for PAL model”
and “8. Color Adjustment for PAL model” alternately until
each specified value is satisfied.
Adjusting method:
1)
Set page: 0, address: 01, data: 01.
2) Change the data of page: D, address: 53, and set the green level
(A) to yellow to the specified value.
3) Press the PAUSE button of the adjusting remote commander.
4) Set page: 0, address: 01, data: 00.
5) Check that the specified value of “Burst Cleaning Adjustment
for PAL model” is satisfied, if not, perform “Burst Cleaning
Adjustment for PAL model”.
Fig. 5-3-33.
2H
A
Yellow
Green